package com.wxit.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.wxit.common.to.es.SkuEsModel;
import com.wxit.common.utils.R;
import com.wxit.gulimall.search.config.GulimallElasticSearchConfig;
import com.wxit.gulimall.search.constant.EsConstant;
import com.wxit.gulimall.search.feign.ProductFeignService;
import com.wxit.gulimall.search.service.MallSearchService;
import com.wxit.gulimall.search.vo.AttrResponseVo;
import com.wxit.gulimall.search.vo.BrandVo;
import com.wxit.gulimall.search.vo.SearchParam;
import com.wxit.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author wj
 * @date 2022.02.27 12:52
 */
@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;

    /**
     * 去es中进行检索
     * @param param 检索的所有参数
     * @return
     */
    @Override
    public SearchResult search(SearchParam param) {
        //1.动态构建出查询的DSL语句
        SearchResult result = null;

        //1.准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);


        try {
            //2.执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            //3.分析响应数据封装成我们需要的格式
            result = buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {

        SearchResult result = new SearchResult();
        //1.返回所有查询到的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        System.out.println("----------" + esModels);
        result.setProducts(esModels);

        //2.当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1.得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            //2.得到品牌的名字
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();

            //3.得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        //3.当前所有上坪涉及到的属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedStringTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1.得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            //2.得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            //3.得到属性的所有值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);


        //4.当前所有商品涉及到的分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");

        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }

        result.setCatalogs(catalogVos);

        //5.分页信息
        result.setPageNum(param.getPageNum());
        //总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //总页码
        int totalPages = (int) total % EsConstant.PRODUCT_PAGESIZE == 0 ? (int) total / EsConstant.PRODUCT_PAGESIZE : ((int) total / EsConstant.PRODUCT_PAGESIZE + 1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i < totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6.构建面包屑导航功能
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            List<SearchResult.NavsVo> collect = param.getAttrs().stream().map(attr -> {
                //1.分析每一个attrs传过来的查询参数的值
                SearchResult.NavsVo navsVo = new SearchResult.NavsVo();
                String[] s = attr.split("_");
                navsVo.setNavValue(s[1]);

                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navsVo.setNavName(data.getAttrName());
                } else {
                    navsVo.setNavName(s[0]);
                }

                //2.取消掉面包屑以后，我们要跳转到的那个地方
                String replace = replaceQueryString(param, attr,"attrs");
                navsVo.setLink("http://search.gulimall.com/list.html?" + replace);
                return navsVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }

        //品牌 分类
        if (param.getBrandId() != null && param.getBrandId().size() > 0){
            List<SearchResult.NavsVo> navs = result.getNavs();
            SearchResult.NavsVo navsVo = new SearchResult.NavsVo();
            navsVo.setNavName("品牌");

            //远程查询所有的品牌
            R r = productFeignService.brandInfo(param.getBrandId());
            if (r.getCode() == 0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName() + ";");
                    replace = replaceQueryString(param,brandVo.getBrandId()+"","brandId");
                }
                navsVo.setNavValue(buffer.toString());
                navsVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }
            navs.add(navsVo);
        }

        //分类  TODO


        return result;
    }


    private String replaceQueryString(SearchParam param, String value,String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value,"UTF-8");
            encode = encode.replace("+","%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String replace = param.get_queryString().replace("&" + key + "=" + encode, "");
        return replace;
    }

    /**
     * 准备检索请求
     * 模糊匹配  过滤(属性 分类  品牌  价格区间  库存）  排序 分页  高亮  聚合分析
     * @return
     * @param param
     */
    private SearchRequest buildSearchRequest(SearchParam param) {

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); //构建DSL语句

        /**
         *  过滤(属性 分类  品牌  价格区间  库存）  查询条件
         */
        //1.构建bool -query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1must 模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }

        //1.2 bool  -- filter   - 按照三级分类id查询
        if (param.getCatalog3Id() != null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }

        //1.2 bool -  filter  按照品牌的id进行查询
        if (param.getBrandId() != null && param.getBrandId().size() > 0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }

        //1.2 bool - filter - 按照所有指定的属性进行查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0){

            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0]; //检索的属性id
                String[] attrValues = s[1].split(":"); //这个属性检索用的值
                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                //
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }

        }

        //1.2 bool - filter  按照库存是否有进行查询
        if (param.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock() == 1));
        }


        //1.2 bool  filter  按照价格区间
        if (!StringUtils.isEmpty(param.getSkuPrice())){
            //1_500/_500/500_
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String skuPrice = param.getSkuPrice();
            System.out.println("skuPrice的结果是:" + skuPrice);
            String[] s = skuPrice.split("_");
            if (s.length == 2){
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1){
                if (param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }

                if (param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        //把以前所有的条件都拿来进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序 分页  高亮
         */

        //2.1排序
        if (!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            //sort=hotScore_asc/desc
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0],order);
        }

        //2.2分页
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3高亮
        if (!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }



        /**
         * 聚合分析
         */
        //1.品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);

        //品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //2.分类聚合 catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3.属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs_attrId");
        //聚合分析出当前attr_id对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //聚合分析出当前attr_id对应的所有可能的属性值attrValue
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);

        String s = sourceBuilder.toString();
        System.out.println(s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return searchRequest;
    }
}
